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Dream 15 was held on July 10, 2010 at the Saitama Super Arena in Saitama, Japan. The event aired live in North America on HDNet.
Dream 15 was contested inside a ring and featured the first round of DREAM’s 2010 Light Heavyweight Tournament.
| Match | Winner | Loser | Method | Round | Time |
| 1 | Kazuhiro Nakamura | Karl Amoussou | Decision (Unanimous) | 2 | 5:00 |
| 2 | Mitsuhiro Ishida | Daiki Hata | Decision (Unanimous) | 2 | 5:00 |
| 3 | Michihiro Omigawa | Young Sam Jung | Submission (Guillotine Choke) | 1 | 7:31 |
| 4 | Tatsuya Mizuno | Melvin Manhoef | Submission (Kimura) | 1 | 7:38 |
| 5 | Gegard Mousasi | Jake O’Brien | Submission (Guillotine Choke) | 1 | 0:31 |
| 6 | Gesias Cavalcante | Katsunori Kikuno | Decision (Split) | 2 | 5:00 |
| 7 | Shinya Aoki | Tatsuya Kawajiri | Submission (Achilles Lock) | 1 | 1:53 |
